David Cameron, who was seven, died under the wheels of a speeding car just yards from his home on Stamfordham Road, Cowgate.

Today, as his parents mark the second anniversary of his death, a Chronicle probe reveals scores of drivers are still ignoring the 40mph limit on the deadly dual carriageway.

We clocked nearly one driver every 30 seconds breaking the speed limit as they zoomed past the flowers laid in David's memory.

It comes as we can expose the worst speeders to have hit the region's roads in the last year.

Figures and images seen exclusively by the Chronicle reveal the highest speeds at which drivers were clocked by cameras.

Cystic fibrosis sufferer David, of Gishford Way, Blakelaw, was knocked off his bike and killed by 21-year-old Mark Tye on June 28 2004.

Tye, of Chapel Park, Newcastle, was weaving in and out of traffic at speeds of at least 61mph in his silver BMW.

He is currently serving a four-year jail term after admitting causing death by dangerous driving.

David's death came just months after family friend Harry Thompson, 74, was killed on the same pedestrian crossing.

Soon after the tragedy, we teamed up with the Northumbria Safety Camera Partnership to record drivers racing down Stamfordham Road. We caught 76 breaking the limit in just 30 minutes. Since then, a 40mph warning sign has been placed on the road and David's parents Debbie, 36, Dave, 43, and sister Kirsty, five, have campaigned tirelessly to warn of the perils of speeding.

Despite this, when we returned to the site, we still caught 52 drivers flouting the law in 30 minutes, with some more than 10mph over the limit.

The worst offender was clocked at 52mph as they hurtled over the crossing where Hylton Primary School pupil David was killed.

Mum Debbie, a childminder, said: "I wish I was surprised by this but I'm not. I drive up and down here regularly and see them racing past.

"What can I say? It's two years today since David died and I'm standing here watching people speed past. What kind of respect for the bairn is that?

"There are just some heartless people out there. I drive past here at 30mph out of respect for David and I wish other people would do the same."

Jeremy Forsburg, of the Northumbria Safety Camera Partnership, said: "Debbie has said that the man who killed her son got four years but she is serving a life sentence.

"People may think they are saving a few seconds but they could be costing a life. We have seen people here at 52mph on a 40mph road.

"That will almost certainly mean death if a child is hit. There's a school right next to this road and it's frightening to see how many people have been using the pedestrian crossing who could have been hit."

Last month, we revealed how David's sister Kirsty is the face of a campaign aimed at urging drivers to slow down on the region's roads. The youngster will feature on posters and in a radio advert set to go out across the region this summer.

See tomorrow's Chronicle for the second part of our investigation into dangerous driving in the North East.

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Exposed: The worst motorists

Speed-mad motorists are bringing potential mayhem to the region's roads.

New figures expose the drivers caught at the highest speeds on each category of road in the North East.

The worst case involved a driver doing 117mph on the A192 spine road, at Cramlington, which has a 70mph limit.

At the 30mph A1147 at Boomarsund, Bedlington, a hatchback driver was clocked at 70mph - 40mph over the limit.

And on the A1058 Cradlewell by-pass, Jesmond, Newcastle, a 40mph road, a motorist was found to be doing speeds of 83mph.

The worst speed at a 50mph road was on the A184 Felling by-pass, in Gateshead, where someone was zapped at 80mph.

All these motorists have received fixed-penalty notices.

Jeremy Forsburg, of the Northumbria Safety Camera Partnership, said: "People driving this fast may save themselves a matter of seconds in time or not even that by going at these speeds.

"But what they think they are saving in time, will cost someone their life. The people on these pictures have no respect for anyone. Their driving in anti-social behaviour, it's criminal to be going at these speeds.

"Doing 70mph in a 30 zone means you are absolutely guaranteed to kill someone and if you imagine it's like walking up to a child and saying I'm going to run into you with a giant piece of metal. What these pictures show is absolutely disgraceful driving."